[PATCH v3 1/6] block: Introduce the flag REQ_NO_WRITE_LOCK

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Not all software that supports zoned storage allocates and submits zoned
writes in LBA order per zone. Introduce the REQ_NO_WRITE_LOCK flag such
that submitters of zoned writes can indicate that zoned writes are
allocated and submitted in LBA order per zone.

Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 block/blk-flush.c         | 3 ++-
 include/linux/blk_types.h | 8 ++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/block/blk-flush.c b/block/blk-flush.c
index e73dc22d05c1..038350ed7cce 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -336,7 +336,8 @@ static void blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq,
 		flush_rq->internal_tag = first_rq->internal_tag;
 
 	flush_rq->cmd_flags = REQ_OP_FLUSH | REQ_PREFLUSH;
-	flush_rq->cmd_flags |= (flags & REQ_DRV) | (flags & REQ_FAILFAST_MASK);
+	flush_rq->cmd_flags |= flags &
+		(REQ_FAILFAST_MASK | REQ_NO_ZONE_WRITE_LOCK | REQ_DRV);
 	flush_rq->rq_flags |= RQF_FLUSH_SEQ;
 	flush_rq->end_io = flush_end_io;
 	/*
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 0bad62cca3d0..68f7934d8fa6 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -416,6 +416,12 @@ enum req_flag_bits {
 	__REQ_PREFLUSH,		/* request for cache flush */
 	__REQ_RAHEAD,		/* read ahead, can fail anytime */
 	__REQ_BACKGROUND,	/* background IO */
+	/*
+	 * Do not use zone write locking. Setting this flag is only safe if
+	 * the request submitter allocates and submit requests in LBA order per
+	 * zone.
+	 */
+	__REQ_NO_ZONE_WRITE_LOCK,
 	__REQ_NOWAIT,           /* Don't wait if request will block */
 	__REQ_POLLED,		/* caller polls for completion using bio_poll */
 	__REQ_ALLOC_CACHE,	/* allocate IO from cache if available */
@@ -448,6 +454,8 @@ enum req_flag_bits {
 #define REQ_PREFLUSH	(__force blk_opf_t)(1ULL << __REQ_PREFLUSH)
 #define REQ_RAHEAD	(__force blk_opf_t)(1ULL << __REQ_RAHEAD)
 #define REQ_BACKGROUND	(__force blk_opf_t)(1ULL << __REQ_BACKGROUND)
+#define REQ_NO_ZONE_WRITE_LOCK	\
+			(__force blk_opf_t)(1ULL << __REQ_NO_ZONE_WRITE_LOCK)
 #define REQ_NOWAIT	(__force blk_opf_t)(1ULL << __REQ_NOWAIT)
 #define REQ_POLLED	(__force blk_opf_t)(1ULL << __REQ_POLLED)
 #define REQ_ALLOC_CACHE	(__force blk_opf_t)(1ULL << __REQ_ALLOC_CACHE)



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